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This question already has an answer here:

What's wrong with my Morning Glory? It's grown outside, the temperature has been around 5-10 °C at night and 10-30 °C at day time since I planted them.

Could it be cold, pH, overwatering?

Morning glory with yellow leaves

marked as duplicate by kevinsky, OrganicLawnDIY, Sue Saddest Farewell TGO GL, Niall C. May 16 '15 at 3:44

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